1256688469247 has 2 divisors, whose sum is σ = 1256688469248. Its totient is φ = 1256688469246.

The previous prime is 1256688469237. The next prime is 1256688469249. The reversal of 1256688469247 is 7429648866521.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1256688469247 is a prime.

Together with 1256688469249, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1256688469249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 628344234623 + 628344234624.

It is an arithmetic number, because the mean of its divisors is an integer number (628344234624).

Almost surely, 2^{1256688469247} is an apocalyptic number.

1256688469247 is a deficient number, since it is larger than the sum of its proper divisors (1).

1256688469247 is an equidigital number, since it uses as much as digits as its factorization.

1256688469247 is an evil number, because the sum of its binary digits is even.

The product of its digits is 278691840, while the sum is 68.

The spelling of 1256688469247 in words is "one trillion, two hundred fifty-six billion, six hundred eighty-eight million, four hundred sixty-nine thousand, two hundred forty-seven".